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99 Bottles of Beer/Prolog: Difference between revisions
→{{header|Prolog}}
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=={{header|Prolog}}==
{{works with|SWI Prolog}}
<lang prolog>bottles(0)
bottles(X):-
writef('%t bottles of beer on the wall \n',[X]),
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:- bottles(99).</lang>
It is possible to extend the previous version so to handle singular and plurals of the word 'bottle':
An other version that handles plural/not plural conditions.▼
<lang prolog>bottles(0):- write('no more bottles of beer').
bottles(B) :-
dif(B,0), NewB is B - 1,
(
dif(B,1), writef('%t bottles of beer on the wall \n',[B]), writef('%t bottles of beer\n',[B]);
writef('%t bottle of beer on the wall \n',[B]), writef('%t bottle of beer\n',[B])
),
write('Take one down, pass it around\n'),
(
NewB > 1, writef('%t bottles of beer on the wall \n\n',[NewB]);
NewB =:= 1, writef('%t bottle of beer on the wall \n\n',[NewB]);
true
),
bottles(NewB).
:- bottles(99).</lang>
<lang prolog>line1(X):- line2(X),write(' on the wall').
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